1 //------------------------------------------------------------------------------ 2 // Copyright (c) 2001-2002, OpenBeOS 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a 5 // copy of this software and associated documentation files (the "Software"), 6 // to deal in the Software without restriction, including without limitation 7 // the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 // and/or sell copies of the Software, and to permit persons to whom the 9 // Software is furnished to do so, subject to the following conditions: 10 // 11 // The above copyright notice and this permission notice shall be included in 12 // all copies or substantial portions of the Software. 13 // 14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 19 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 20 // DEALINGS IN THE SOFTWARE. 21 // 22 // File Name: EventQueue.h 23 // Author: Ingo Weinhold (bonefish@users.sf.net) 24 // YellowBites (http://www.yellowbites.com) 25 // Description: A class providing a mechanism for executing events at 26 // specified times. 27 //------------------------------------------------------------------------------ 28 29 #ifndef EVENT_QUEUE_H 30 #define EVENT_QUEUE_H 31 32 #include <List.h> 33 #include <Locker.h> 34 #include <OS.h> 35 36 class Event; 37 38 class EventQueue : public BLocker { 39 public: 40 EventQueue(const char *name = NULL); 41 virtual ~EventQueue(); 42 43 status_t InitCheck(); 44 45 void Die(); 46 47 bool AddEvent(Event *event); 48 bool RemoveEvent(Event *event); 49 void ModifyEvent(Event *event, bigtime_t newTime); 50 51 private: 52 bool _AddEvent(Event *event); 53 bool _RemoveEvent(Event *event); 54 Event *_EventAt(int32 index) const; 55 int32 _IndexOfEvent(Event *event) const; 56 int32 _FindInsertionIndex(bigtime_t time) const; 57 58 static int32 _EventLooperEntry(void *data); 59 int32 _EventLooper(); 60 void _Reschedule(); 61 62 BList fEvents; 63 thread_id fEventLooper; 64 sem_id fLooperControl; 65 volatile bigtime_t fNextEventTime; 66 status_t fStatus; 67 volatile bool fTerminating; 68 }; 69 70 #endif // EVENT_QUEUE_H 71